$blue: #45c1ff;
$cyan: #3ef3f6;
$yellow: #ffd154;
$red: #ff7777;
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  background: #f4f5f9;
}
// 卡片样式
.card {
  width: 100%;
  background-color: #fff;
  border-radius: 13px;
  padding: 30px;
  margin: 20px 0;
  overflow: hidden;
}
// 页面标题
h2 {
  font-size: 39px;
  font-family: PingFang SC;
  font-weight: bold;
  color: #ffffff;
  text-align: center;
  margin-bottom: 50px;
}
